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WALDRON J. CHEYNEY, OF WALLINGFORD, AND EMlL F. DIETERICHS, OFPHILADELPHIA, PENNSYLVANIA.

Letters Patent No. 69,315, dated October 1, 1867; antedatcd September20, 1867.

IMPROVED ARCHITECTURAL PORCELAIN.

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TO ALL WHOM IT MAY CONCERN:

Be it known that we, WALDnoN J. Cnnymzr, of Wallin lord, Delawarecounty, and EMIL F. Drn'runrcus, of the city and county of Philadelphia,both of the State of Pennsylvania, have invented a new and usefulimprovement in building material, which we call Architectural Porcelain;and We do hereby declare that the follow ing is a full and exactdescription of the same.

Our material may he used for building-blocks, either hollow or solid;pillars or columns, either hollow or solid; cornices and balusters,either hollow or solid; caps, sills, tiles for floors, roofs, and walls,either inside or outside; mouldings, centre-pieces, bath-tubs,Wash-stands, basins, urinals, and generally for all articles,

either of use or ornament, which are employed in the construction andfitting up of buildings.

Our architectural porcelain is composed of cryolite, or its chemicalequivalents, and silica, alone or in com-' bination with the oxide ofzinc, the whole fused together in a crucible, and cast in moulds, orpressed or rolled, the choice of either of these modes of productionbeing governed by the form of the article desired.

In making our architectural porcelain, we have found the followingcombination and proportions to answer well, (although the oxide of zincmay be omitted, or another metallic oxide substituted for it, or theproportions of the other minerals varied, without material detriment; ifthe cryolite is materially diminished, an alkali must be added:) Fiftypounds of sand, (silici0us,) twenty pounds of cryolite, (powdered,) fivepounds of whiteoxide of zinc.

Having thus described our invention, we claim, and desire to secure byLetters Patent, as a newarticle of manufacture- Architecturalporcelain," composed of cryolite, or its chemical equivalents, andsilica, alone, or cryolite, or its chemical equivalents, in combinationwith silica and a metallic oxide, or an alkali, or both, fused and castin moulds, and pressed or rolled, as above set forth.

. WALDRON J. OHEYNEY,

E. F. DIETERICHS.

Witnesses:

GEO. E. BUGKLEY, F. B. KENNER.

